.storage-item {
    width: auto;
    padding-left: 0.5vw;
    margin-right: 0;
    /* border-left: 2px solid #777; */
    height: auto;
    overflow: hidden;
    user-select: none;
    transition: 0.3s;
    box-sizing: border-box;
    position: relative;
}

.title-item {
    padding: 0.25vh;
    line-height: 1.5vh;
    user-select: none;
    position: relative;
}

.title-item:hover {
    background-color: #DDD;
    transform: translateX(-2px);
}

.list-item {
    user-select: none;
    transition: 0.3s;
}
.fold-list-item {
    height: 0px;
}

.list-item.selected-item::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 2px solid #777;
    box-sizing: border-box;
    pointer-events: none;
}

.down-drop {
    display: inline-block;
    transform: rotate(45deg) scale(0.5);
    border-right:2px solid #777;
    border-bottom:2px solid #777;
    height: 1.5vh;
    width: 1.5vh;
    transition: 0.3s;
}
.down-drop.fold{
    transform: rotate(-45deg) scale(0.5);
}